| Castle Rock to Abilene (Texas) | 557.12 mi (896.61 km) |
| Castle Rock to Accokeek (Maryland) | 1,489.80 mi (2,397.60 km) |
| Castle Rock to Acworth (Georgia) | 1,173.67 mi (1,888.83 km) |
| Castle Rock to Ada (Oklahoma) | 551.96 mi (888.30 km) |
| Castle Rock to Addison (Illinois) | 898.90 mi (1,446.64 km) |
| Castle Rock to Addison (Texas) | 629.25 mi (1,012.68 km) |
| Castle Rock to Adelanto (California) | 768.70 mi (1,237.11 km) |
| Castle Rock to Adelphi (Maryland) | 1,487.74 mi (2,394.29 km) |
| Castle Rock to Adrian (Michigan) | 1,102.05 mi (1,773.58 km) |
| Castle Rock to Affton (Missouri) | 781.69 mi (1,258.00 km) |
| Castle Rock to Agoura Hills (California) | 848.99 mi (1,366.32 km) |
| Castle Rock to Aguadilla (Puerto Rico) | 2,671.13 mi (4,298.76 km) |
| Castle Rock to Aiken (South Carolina) | 1,342.84 mi (2,161.09 km) |
| Castle Rock to Akron (Ohio) | 1,232.68 mi (1,983.81 km) |
| Castle Rock to Alabaster (Alabama) | 1,087.94 mi (1,750.87 km) |
